Hepatic encephalopathy
ICD-10 K72.9 · ICD-11 DB99.5

Treatment of Overt Hepatic Encephalopathy Grade 3–4: ICU Management and Transplant Evaluation

Overt hepatic encephalopathy (HE) at grade 3 or 4 represents severe neurological impairment with a substantially elevated risk of airway compromise. This scenario requires an escalated clinical response that goes beyond standard ward-level management.

At grades 3–4, impaired consciousness places patients at immediate risk of aspiration. The clinical priority is securing airway safety alongside addressing the underlying hepatic disease trajectory — including timely evaluation for liver transplantation as a definitive treatment option.

The structured protocol for this scenario involves an intensive-care-level approach for airway monitoring and patient safety, combined with prompt referral to a transplant centre — the complete protocol specifies the criteria, escalation pathway, and referral thresholds in full.
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References

DOI: 10.1016/j.jhep.2022.06.001

Patients with overt HE grade 3 and 4 are at risk of aspiration and should be treated in the ICU.

In patients with HE grade 3-4, and a Glasgow coma score less than 7, respiratory function is endangered as the patient is unable to protect their airways.

Patients with recurrent or persistent HE should be considered for liver transplantation and a first episode of overt HE should prompt referral to a transplant centre for evaluation (LoE 5, strong recommendation, 85% consensus).

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